PRACTICE QUESTIONS

1. The development of the duct system in the mammary gland is under the control of estrogens, growth hormone, and adrenal steroids. If the duct system is to develop functional milk-secreting units, called alveoli, which of the following hormone(s) are essential to this development?

a.

b. Prolactin

c. Relaxin

d. Prolactin and progesterone

e. Prolactin and relaxin

f. Progesterone and relaxin

2. The hormone that is most important for the maintenance oflactation (lactogenesis) is:

a. Estrogen

b. Oxytocin

c. Progesterone

d. Prolactin

e. Relaxin

3. Sensory inputs, including sound, sight, and smell, but not necessarily touch, elicit the release of what important hormone required for the lactation process in the cow?

a. Estrogen

b. Oxytocin

c. Progesterone

d. Prolactin

e. Relaxin

4. The contraction of what anatomical structure is of fundamental importance for the release of milk from the udder of the cow?

a. Alveoli

b. Duct

c. Myoepithelial cell

d. Duct cistern

e. Teat cistern

5. The most important energy source in milk is:

a. Carbohydrates

b. Lactose

c. Lipids

d. Proteins